balance team on player join

src/server/game/ServerGame.cpp

@@ -134,5 +134,10 @@ void ServerGame::OnGameClose() {
 	m_Server->Restart();
 }
 
+void ServerGame::OnPlayerJoin(game::PlayerID id){
+	if (m_GameState == game::GameState::Game)
+		BalanceTeams();
+}
+
 } // namespace game
 } // namespace td